Rotary edge-trimming tool.



No. 795,384. PATENTED JULY 25, 1905. G. G. BELMER. ROTARY EDGE TRIMMING TOOL.

APPLIOATIOH FILED JULY 5. 1899.

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APPLICATION FILED JULY 5. 1899.

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UNITED STATES PATENT OFFICE.

CHARLES Gr. BELMER, OF CHELSEA, MASSACHUSETTS, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO BRIGGS-BELMER EDGE TOOL COMPANY, OF PORTLAND, MAINE.

ROTARY EDGE-TRIMIVIING TOOL.

Application filed July 5,

To all 1071,0772, it 722/14 concern:

Be it known that 1, CHARLES G. Bnmma, of Chelsea, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Rotary Edge-Trimming Tools, of which the following is a specitication.

This invention relates to a rotary edge-trimming machine, which is especially adapted to be employed in trimming the edges of the soles of turned or imitation turned shoes, and has for its object to provide a device of this character which is of simple and durable constructionand which may be readily adjusted to adapt it to the edges of soles of different thickness.

On the drawings similar reference-letters indicate similar parts or features wherever they occur.

Of the drawings, Figure 1 indicates in end elevation a machine or tool embodying my invention. Fig. 2 represents a side elevation of the same. Fig. 3 represents an end view with the rand-guard removed and on the line 3 3 of Fig. 4. Fig. 4 represents a longitudinal section on the line 4: A of Fig. 2. Fig. 5 represents an end view with the rand-guard and the cutter removed to show the guard for the edge of the sole. Fig. 6 shows a sole-guard detached. Fig. 7 represents an end view of the casing or sleeve. Figs. 8 and 9 represent the cutter. Fig. 10 illustrates the operation of the cutter.

The shaft, which is adapted to be mounted in suitable bearings and is rotated in any desired way, is indicated at a and has a reduced end a, separated therefrom by a shoulder (4 Upon this shaft is rigidly and adjustably secured a sleeve 7) by means of a set-screw Z). The end of the sleeve is enlarged at b to form a hollow casing in which there is an internal flange or shoulder 6 The cutter comprises a sleeve 0, placed upon the reduced end a" of the shaft and abutting against the shoulder a there being on the outer end of said sleeve a plurality of cuttingblades 0. Said blades are arranged tangentially to a circle inscribed about the axis of the sleeve, and they are formed with rearwardly-beve'led cutting edges 0 to attack the inner or upper edge of the sole of the shoe. The cutter may be secured upon the shaft in any suitable way through the medium of a screw (Z, which is passed through a rand-guard Specification of Letters Patent.

1899. Serial No. 722,787.

Patented July 25, 1905.

e. Said rand-guard may be formed in the usual way, and it is preferably projected radially a short distance beyond the ends of the cutting edges 0 of the blades, as shown in Fig. 4:, to guard the rand and the upper from being cut when the tool is used.

Between the blades and the enlarged end 7/ of the sleeve 5 is a ring or sole-guard f. Said ring fits snugly within the said enlarged end 6 and abuts against the shoulder or flange L as best shown in Fig. 4. Its front end bears against the rear faces of the blades 0 of the cutter, so as to expose only the operative parts of the cutting edges 0 being beveled and concaved, as at W'hen the tool is in use, the outer or lower edge of the sole bears against the outer face of the ring f, which is exposed between the casing and thecutter, and the grain is laid down and prevented from being cut.

For the purpose of varying the effective length of the cutting edge of the cutter-blades I provide the end of the ring or guard f with a series of recesses f, in which the blades of the cutter may be set, as shown in Fig. 3, when a sole having a thin narrow edge is to be trimmed. When in this position, a portion of the cutting edges of the cutterblades will extend in beyond the concave surface f of the guard-ring, so that a portion only of said edges may engage the work against which the cutter is pressed. When the tool is used to trim a sole having a thick edge, the cutters will be arranged to rest directly against the end of the ring between said notches, so that the cutting edges of the blades will be effective thoughout their entire length. This is the most important feature of my invention, as it enables the same tool to be readily used for different kinds of shoes by simply loosening the screw (Z and twisting the cutter to a different position.

The ring and cutter may be adjusted so that the ends of the cutter-blades will bear on the surfaces of the edge of the ring between the notches f instead of entering said notches, thus enabling one cutter to trim two different widths. The machine may be provided with a plurality of rings and cutters of different diameters. It is my practice to provide more rings than cutters, it being desirable to use a ring of smaller diameter after the diameter of the cutter has been reduced by wear and grindin g. In referring to the rings as being of different diameters it will be understood that Imean the smaller ends of the rings. Of course the larger end of the ring must necessarily be large enough to fit snugly within the casing. The small ring which abuts against the cutter may be increased or decreased in diameter, according to the diameter of the cutter, the bevel of the ring varying with the diameter of the smaller end. In other words, it is very desirable that the sole-engaging surface of the ring or sole-guard f should meet or practically intersect the path of movement of the cutting edges of the blades, the circular line of inter section thereof being varied as the blades are changed from a position on the blade-seats on the front sides of the ring to the seats at the bottom of the blade-receiving recesses or notches f therein, thereby correspondingly varying the effective cutting edge of the cutter-blades.

Space is left between the end of the ring and the rand-guard for the chips to pass through to the interior of the casing formed by the expanded portion 6 and the ring f, and egress is provided by a plurality of apertures #formcd in the outwardly-projecting portion 1/ of the sleeve. When the tool is rotated rapidly, a current of air flows through the tool, being induced by the shape of the euttingblades and the chips are blown from the apertures 2. The cutters project or extend in the direction of rotation of the tool, being tangential to a circle inscribed about the axis thereof. As

the cutter rotates, therefore, the blades have a tendency to draw in air, and as there is an escape-outlet afforded by the apertures it will be readily seen that a current of air is quickly induced to flow through the tool as described.

It is evident that changes may be made in the construction which I have described without departing from the spirit and scope of the invention.

Having thus explained the nature of the invention and described a way of constructing and using the same, although without having attempted to set forth all of the forms in which it may be made or all of the modes of its use, I declare that what I claim is- An edge-trimming machine comprising a shaft, a rand-guard, acutter having a plurality of blades, an annular sole-guard having in its front end a plurality of blade-receiving recesses adapted to cover a portion of the cutting edges of said blades, and seats between said recesses for the rear side of said blades whereby the effective length of the cutting edges of said blades may be varied, substantially as described.

In testimony whereof I have affixed my signature in presence of two witnesses.

CHARLES Gr. BELMER.

Witnesses:

C. F. BROWN, E. BATOHELDER. 

